Concrete cutting tool



July 8, 1952 I J. R. coLLEY 2,602,640

doNcRETE CUTTING Toor.

Filed Nov. 25, 1946 ooofo Josef/1 /f Co//g INvsNmR.

Patented July 8, 1952 UNITED STATES PATENT OFFICE CONCRETE CUTTING TooI.

Joseph R. Colley, Chesterton, Ind. Application November z5, 1946, serial Nu. 712,224

(C1. c55-c2) 1 Claim. 1

My invention relates to improvements in a concrete cutting tool and it more specifically comprises the structure described in the specification and pointed out in the annexed claims.

The purpose of my invention is to provide a cutting tool that projects radially from one side of a hexagon or round bar; that has a guiding portion on the bar in advance of the wedging portion; that uses a pneumatic drive for the tool which is held in the hands of the operator; and that, due to the rapid reciprocation of the tool, that portion of a concrete wall located between two adjacently drilled holes is rapidly removed.

With these and other yrelated ends in view I illustrate in the accompanying drawingr such an instance of adaptation as will disclose the broad underlying principles of the device without limiting myself to the specic details shown thereon and described herein.

Fig. 1 is a detached elevation of a portion of a concrete wall showing a group of pre-drilled holes in spaced-apart relation.

Fig. 2 is a cross section of Fig. 1, showing the cutting tool in position in one of the drilled holes.

Fig. 3 is a detached elevation of a tool with a pneumatic operated handle showing the entire tool. y

Fig. 4 is an enlarged elevation of the end view of the tool in position in vone of the preformed holes and showing the relation of that hole to a companion hole in spaced apart relation above the one that is occupied by the tool and a similar hole in spaced apart relation below the central hole in which the tool is placed. Y

Fig. 5 is an elevation of a slab of concrete showing a group of related pre-formed holes that outline a portion of the concrete Wall that is to be removed, through the cutting of the material between holes. y

In practically adapting my invention to its intended purpose, I may make whatever changes in ting edge 1 of the tool is the part 5 which rst enters a preformed hole 2. The entering end 5 steadies the tool as it rapidly reciprocated by the tube 8 connected to a source of pneumatic pressure 9. A cutting edge 1 is formed on the front edge of the projecting portion 6.

'I'here is always a great difliculty in puncturing g. wall of concrete, similar to the diagram, Fig.

The cutting member or nn 6 has an outwardly 2 and rearwardly inclined edge portion extending away from the pointed end 3 of the stem, and an outwardly and forwardly inclined edge portion meeting the rst edge portion to form a sharp point, said first edge portion being beveled to form a cutting or wedging surface 1 that-acts in two directions, radially and transversely at the same time.

It is immaterial how thick the concrete Wall may be as the pilot end 5 of the tool always guides it so that the wedging portion 6 will rapidly remove the previously untouched portion 3. In fastening the tool in the pneumatic holder, the blade 6 is set at the desired angle or its angle may be changed by bodily twisting the pneumatic holder around its axis as needed. It is immaterial whether the concrete wall is either relatively thin or very thick.

In quarrying limestone, sandstone, or granite. or in preparing for the removal of a portion of a cement wall, the progress is simplied through the use of a large number of neighboring holes formed in such numbers as to entirely surround a given area which is to be removed. This is quickly done by a wedging action against the narrow wall that is not removed between the adjacent holes. When all the walls are removed by the wedging action'of the edge 1 of the tool, the entire area is separated..

Without the use of my tool under the control of the pneumatic holder, the untouched portion 3 between adjacent holes 2 must be removed by hand chiseling, which is a laborious and expensive procedure.

What I claim is:

A concrete cutting tool comprising an elongated stem having a pointed end, a radially projecting blade mounted on the stern a short dis.. tance away from said pointed end, said blade having an outwardly and rearwardly inclined edge portion extending away from the pointed end of the stern, and an outwardly and forwardly inclined edge portion meeting the first edge portion to form a sharp point, said first edge portion being bevelled to form a cutting or wedge surface.

JOSEPH R. COLLEY.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Y 

